ClassListReaderFactory.java

package org.mutabilitydetector.cli;

/*
 * #%L
 * MutabilityDetector
 * %%
 * Copyright (C) 2008 - 2014 Graham Allan
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */



import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

public class ClassListReaderFactory {

    private final File classListFile;

    public ClassListReaderFactory(File classListFile) {
        this.classListFile = classListFile;

    }

    public ClassListToReportCollector createReader() {
        String fileName = classListFile.getName();

        if (fileName.endsWith(".txt")) { return constructPlainTextReader(); }

        // default case
        return constructPlainTextReader();
    }

    private ClassListToReportCollector constructPlainTextReader() {
        BufferedReader br;
        try {
            br = new BufferedReader(new InputStreamReader(new FileInputStream(classListFile), Charset.forName("UTF-8")));
        } catch (FileNotFoundException e) {
            throw new ClassListException("Could not read class names from given file (" + classListFile.getAbsolutePath()
                    + ")",
                    e);
        }
        return new PlainTextClassListToReportReader(br);
    }

}